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Income Taxes - Schedule of Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Deferred tax assets (liabilities): |  |
Capitalized inventory costs | $ 168 | $ 193
Inventory write-downs | 2,856 | 1,333
Accrued warranty | 161 | 204
Deferred profits | 346 | 1,006
Accruals and reserves not currently deductible | 3,531 | 5,017
Stock option expense | 849 | 738
Federal net operating loss carryforwards | 6,979 | 2,922
Foreign and state net operating losses | 10,481 | 13,860
Book vs. tax depreciation and amortization | (1,546) | (1,667)
Other deferred tax assets | 75 | 163
Total deferred tax assets | 23,900 | 23,769
Valuation allowance | (23,900) | (23,769)
Deferred tax assets, net of valuation allowance | $ 0 | $ 0

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